Improvement in permutation-padlocks



Patented ,April 2, 1878.

WITNESSES INVENTOR,

ATTORNEYS- N PETERS. FHOIT}Li'l'NOGWAPNER WASHINGYON} D.'C.

UNITED STATES PATENT OFF GE.

GEoRGE w. GRovE, or LINNVILLE, onro.

IMPROVEMENT IN PERMUTATlON-PADLOCKS.

Specification forming part of Letters Patent No. 202,022, dated April 2, 1878; application filed March 9, 1878.

To all whom it may concern:

Be it known that I, GEORGE W. GROVE, of Linnville, in the county of Licking and State of Ohio, have invented a new and valuable Improvement in Combination-Locks; and I do hereby declare that the followingis a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification, and to the letters and figures of reference marked thereon.

Figure 1 of the drawings is a front view of my combination-lock. Fig. 2 is a transverse vertical section. Fig. 3 is a vertical section,

and Figs. 4. and 5 are detail views, thereof.

The nature of my invention consists in the construction and arrangement of a combination-lock, as will be hereinafter more fully set forth.

The annexed drawing, to which reference is made, illustrates my invention applied to a padlock.

A represents the body of the lock-case, with back-plate B rivetedthereto. O isthe shackle, which is pivoted at a, and its other end provided with a slot, as, to be caught by the spring-catch D within the lock-case when the shackle is closed. The spring-catch D is pivoted at b, and upon the same pivot is placed a thumb'piece, E, which projects through the side of the lock-case. This thumb-piece has within the case an arm, d, which lies in front of the spring-catch, so that by pressing inward on the thumb-piece the spring-catch will be pushed'back and the shackle can be opened.

The back plateB of the case isprovided with a central hub, G, which projects through an enlarged circular holein the front of the lockcase.

On the hub Gr, within the lock-plate, is placed a series of tumblers, F F F, made in the shape of annular rings or plates, of equal outside diameter; but their inside diameters are graduated, as shown. These annular tumblers are, respectively, provided with an inwardly-projecting tooth, t" t '6 and in their outer edges with a slot, h h 71. as shown.

On the front of the lock-case are placed disks H 11 H provided, respectively, with tubes 1* I I, projecting around the hub G inward into the lock. These disks, with their tubes, are of different sizes,"and said disks are, at their outer edges, formed in the shape of a series of radial arms, which are lettered A B O D, &c., and from each arm containing the letter A projects a pin, k.

The inner ends of the tubes I I I are notched tocorrespond with the arms of their respective disks.

The tumblers F F -F are held against the inner side of the front of the lock-case by a spring-key, L, inserted either in grooves in or a slot through the hub G; 1

The notched tubes 1 Pjfifit, respectively, on the teeth t t t of the tumblers.

The combination being set to certain letters -for instance, H I P-the disks will be turned so as to bring said letters in aline with a pin or mark, y, 0n the' lock-case, when the slots k h h of the tumblers will be in such position that the arm d of the thumb-piece will enter the same and the lock can be opened; but if these letters are not in such position, one or more of the tumblers will-present a solid edge to the arm d, and the thumb-piece cannot be pressed in to open the lock.

It will, however, be noticed that the springcatch D works behind the tumblers; hence when the lock is open it can be closed and locked, no matter in what position the tumblers may be.

For the purpose of changing the combina tion the lock-case is provided between the two ends of the shackle with a plate, J, hinged at a, and closed at the other end by a screw, m, arranged at such a point that a shoulder, a, of the shackle will come on top thereof, and thus prevent the same-from being removed when the lock is closed."

By removing the set-screw m the plate J can be opened, and the key L then withdrawn.

The tumblers willthen fall out of gear, and the 'lettereddisks can be moved as desired, and

the tumblers brought into gear again, and the spring-keyinserted, and plate closed. A doorlock maybe constructed on the sameprinciple. What I claim as new, and desire to secure by Letters Patent, is-

1. In a combination-lock, the combination,

In testimony that I claim theabove I have hereunto subscribed my name in the presence of two witnesses.

GEORGE W. GROVE.

Witnesses J. W. SwrTzER, FRANCIS M. LAYTON. 

